In examining a baseline vibration signature and the historical record of periodic vibration analyses, what must be considered for the evaluation of rotating machinery?
• Baseline vibration signature and how it is used as a reference condition • Difference between absolute vibration limits and trends/changes over time • How increasing vibration levels can indicate developing faults in rotating machinery
• Ask yourself: Is it enough to know only how much vibration there is right now, or do you also need to know how it is changing compared with the baseline? • Think about what an engineer would worry about more: a vibration that is just under a limit but rising quickly, or one that is steady and well‑behaved over time. • Which options ignore either the present vibration severity or the trend over time, and why might that be dangerous in real machinery?
• Identify which choices consider both present severity (limits) and the trend over time. • Eliminate any option that tells you to ignore maximum vibration limits, because machinery has design or alarm limits. • Eliminate any option that tells you to ignore changes over time, because trending is the main purpose of periodic vibration analysis.
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